Rotor



Dec. 6, 1927.

S. M. HANSEN.

ROTOR Filed Aug. 11. 1927 Patented Dec. 6, 1927.v

UNITED sr P..frlzri'r OFFICE. n

SINIUS M. H-ANSEN', OF LYNN, MASSACHUSETTS, ASSIGNOB TO HORACE I. EATON,

TRUSTEE, OF NAHANT, MASSACHUSETTS.

ROTOB. l

Application led August 11, 192'?.Y Serial No. 212,237..

ThisA invention lrelates to an improved rotor adapted particularly for blowers and desi ed for high rotary and peirpheral s ee s. pThe present invention provides a rotor of this character which may be made of sheet metal and which therefore may be of inexpensive construction and may have a low moment of inertia and consequent low centrifugal stresses so that it is adapted to rotate atan extremely high speed in order to provide a fairly high air pressure and a1r velocity. Furthermore, although this rotor is formed of sheet metal, which is naturally a somewhat resonant material, the metal is so disposed and arranged that the rotor has little resonance so that no objectional noise emanates from the same even at very high speed. The outstanding blades of the improved rotor are so disposed and arranged that they are locked more firmly in engagement with the body portion of the rotor as the air pressure increases. An article of this character ma be made at a low cost without the need o especially accurate workmanship or care to obtain a satisfactory rotational balance due to uniform centrifugal stresses.

The above and further advantageous features of the invention will be apparent to those skilled in the art upon a reading of the subjoined description and claims in conjunction with the accompanying drawings, in which Fig. 1 is a view of a blower installation in which the improved type of fan is shown in cross section;

Fig. 2 is an enlarged cross section of a portion of the fan;

Fig.- 3 is a top view of a portion of the rotor; Fig. 4 is a side elevation of a portion of the rotor; and

Fig. 5 is a view corresponding to Fig. 2 but showing afan Ahaving blades upon one side only.

A rotor of the character disclosed by the accompanying drawings is designed to be used in a blower for providing a forced current of air or for similar purposes. Such an installation ofthe improved rotor is disclosed in Fig. 1, wherein the electric motor 5 rotates shaft 6 upon which the rotor 7 is secured. Disposed about the rotor is a casing 8 having central openings 9 adjoining itsv the rotor fans. The casing is provided with an outlet 10 -into which the air is delivered.

The unproved rotor preferably is formed of .plates o r laminae of sheet metal and compr1ses an intermediate supporting plate or -disk 12 h aving its central portion fitted upon the bushlng 13 whlch in turn may be keyed to'drive shaft 6 or secured thereto in any suitable manner. Disposed at either side of d1s k 12 are the fan plates 14 which -preferably are dished so that their central portions are spaced from' the adjoining portion of plate 12. Spacers or distance members 15 are disposed between the central portions of the adJolnlng disks, Fig. 2, while the bushing 13 may have an extremity flanged over as designated'by numeral 16, to hold intermediateportions of the plates firmly in position upon the bushing.-

The peripheral areas of disks 14 preferably are arranged with marginal portions in engagement wlth disk 12. In other words,

these peripheral portions are disposed at an angle to the dished portions of the fan plates as shown. The blades 19 are formed u on these peripheral areas of disks 14. Pre erably the blades ma cuts in substantially radial directions inwardly from the circumference of the disk and continuing the cuts in curved extensions,v each of which has a substantial component in a circumferential direction. Thus each fan blade is defined upon its outer end by the circumference of the disk and upon two of its sides by the cut with its curved extension. The' remaining side of each blade is defined by the bend or fold 21, the metal of the blade being folded out substantially at right angles to t e plane of' disk 12 and the marginal portions of disks 14. Thus each of the blades preferably comprises a struck out sheet metal portion of substantially quadrilateral form having a straight edge adjoining the circumference of the .rotor and a straight edge paralleling the main plate thereof, while its inner endis curved, being formed by the curved cut at the inner portion of the circumferential area.

The cut-away portions ofdisk 14 left by the bent out blades 19 are spaced by substantial peripheral portions or blade Vsupports 24, each of which preferably may have a surface area of somewhat the order of the area of` the blades. These portionsk of the plates 14preferably are secured to the supbe outlined by making porting plate 12 by an suitable means 25,

such as s ot welding. referabl fastening means o this character is locate adjoining the, cut portion at the edge of each blade support area and spaced from the bend ywhere l the blade supporting portion joins the outstanding blade, Fi 4. Thus the marginal area of each fan p ate is broken u into a series of similar parts, each of whic 1 comprises a sheet metal blade supporting portion of substantial area held in abutting engagement with the central plate and an extension of this portion .bent out substantiall at right angles to compose a fan blade. Pre erably the blades of the fan plates upon op osite sides of the rotor are aligned with eac other in order to obtain substantial balancing of transverse stresses in a rotor of this character having two fan plates. Each bend 21 preferably is so disposed that a continuation thereof will fall somewhat to one side of the center of the rotor; for example, one satisfactory manner of laying out the blades isto arrange this line so that it will lie substantially parallel to the radius of the rotor. Thus the plane of the blades is at a slight angle to a radius which intersectsA the same.

F i0'. 5 discloses a similar form of rotor fori installation in blowers of smaller capacityv which has blades upon one face only of the supporting plate. For example, this form of rotor comprises a supporting plate 42 and a single fan disk 44 disposed in abutting engagement with the supporting plate. The vanes 19 are formed upon disk 44 in a manner exactly analogous to that disclosed in the other form ofv the invention, and the plates 44 and 42 may be welded together' in a similar manner. The central portions of the plates are mounted upon the sleeve 44, which is provided with an annular flange 46 and a retaining washer 47 between which disks 42 and 44 are held. Suitable pins or rivets 49 extend through Washer 47, flange 46, and the ortionsl ofv the plates therebetween in ordlr lirmly to lock the parts together.

A rotor of the type disclosed herein `is adapted effectively to withstand extremely high peripheral speeds due to the advantageous and scientific distribution and disposition of the sheet metal and of the means of securing the parts together. Thus the rotor is movable in the direction indicated by the arrow of Fig. 4, the air is thrown centrifugally outward and passes out through outlet 10, this How of air being aided by the disposition of blades at a slight angle to the radius of the rotor. The pressure of the air upon the vanes forces the portions of areas 24 which adjoin bends 21 more firmly into engagement with the supporting plate 12 so that the higherthe rotational speed and the greater the fluid pressure themoresecurely are the blades heldl in place and the parts of the rotor held toget er; the fasteningmeans 25'may be comparatively light since little strain is thrownthereon. In fact, it is commercially ractical to make rotors of this type in whic the i ortions of the blade supports adjoining ends 21 normally are spaced slightly from the adjoining faces of plate 12, since the air pressure will force these members into firm engagement to `avoid resonance of the parts.

Obviously since the rotor is formed of sheet metal whichmay be of comparatively thin section, its moment of inertia is low,

the centrifugal forces are consequently low,

gagement With'the peripheral portion of the supporting plate provides an unusually irm construction, this type of laminated structure consequently permitting the provision of rotors having comparatively low resonance in spite of their high speed of operation. v

I claim:

1. A rotor l:for fans, blowers or the like, comprising a circular supporting plate, a fan plate, peripheral portions of the fan plate comprising blade supports and being held in abutting engagement with the supporting plate, said blade supports each having a substantial area, integral extensions of said blade supports being bent out to form blades. l

2. A rotor for fans, blowers or the like, comprising a circular supporting plate, a fan plate, peripheral portions of the fan plate comprising blade supports and being held in abutting engagement with the supporting plate, said blade supports each hav- Provision of the i ing a substantial area, integral extensions of `comprising a circular supporting plate, a

fan plate, peripheral portions of' the fan plate comprising blade supports and being v held in abutting engagement with the supporting plate, said blade supports each having a substantial area, integral extensions of said blade supports being bent out to form blades, the line of the bend between each blade and blade support `falling to one side of the radius of the plate which intersects the blade,'whereby the blade lies at an angle to the radius.

4. A rotor for fans, blowers or the like, comprising a circular supporting plate, a fan plate, peripheral portions of the fan plate comprising blade supports and being held in abutting engagement with the supporting plate, said blades supports each having a substantial area, integral extensions of said blade supports being bent out to form blades, the width of each blade support being substantially as great as the distance between the bend and the opposite outer edge of the blade.

5. A rotor for fans, blowers or the like, comprising a circular supporting plate, a fan plate, peripheral portions of the fan plate comprising blade supports and being held in abutting engagement with the supporting plate, said blade supports each having a substantial area, integral extensions of said blade supports being bent out to form blades, the width of each blade support being substantially as great as the distance between the bend where. it joins the blade and the opposite edge of the blade, and means securing each blade support to the supporting plate being disposed at a part of the blade support which is spaced from the blade that is integral therewith) 6. A rotor for fans, blowers or the like, comprising a circular supporting plate. a fan plate, peripheral portions of the fan plate comprising blade supports and being held in abutting engagement with the supporting plate, said blade supports each 'having a substantial area, integral extensions of said blade supports being bent out to form blades. said blades being of substantially quadrilateral form, and being bent out substantially at right angles to the blade supports.

7. A rotor for fans, blowers or the like, comprising a sheet metal supporting plate, a pair of sheet metal fan plates, peripheral portions of the fan plates comprising blade supports and being held in abutting engagement with the supporting plate, said blade supports each having a substantial area, integral extensions of said blade supports being bent out to form blades, said blades being of substantially quadrilateral form, and being bent out substantially at right angles to the blade supports.

8. A rotor for fans, blowers or the like, comprising a circular .supporting plate, a pair of fan plates, peripheral portions of the fan plates comprising blade supports and being held in abutting engagement with the supporting plate, said blade supports each having a substantial area, integral extensions of said blade supports being bent out to form blades, said blades being of substantially quadrilateral form. and being bent out substantially at right angles to the blade supports, the blades at oppositelsides of the fan platesbeing mutually aligned.

9. A rotor for fans, blowers o1' the like, comprising a circular supportin plate, a pair of fan plates, peripheral portions of the fan plates comprising blade supports and being held in abutting engagement with the supporting plate, said bladel supports each having a substantial area, integral extensions of said blade supports being bent out to form blades. said blades being of substantially quadrilateral form and being bent out substantially at right angles to the blade supports, the central portions of the fan plates being dished away from the supporting plate to provide the rotor with additional transverse rigidity.

10. A rotor for fans, blowers or the like, comprising a circular supporting plate, a pair of fan plates, peripheral portions of the fan plates comprising blade supports and being held in abutting engagement with the supporting plate, said blade supports each having a substantial area, integral extensions of said peripheral portions being bent out to'form blades, said blades being of substantially quadrilateral form and being bent out substantially at right angles to the blade supports, the blades at opposite sides of the fan plates being mutually aligned, the central portions of the fan plates being dished away from the supporting plate to provide the rotor with additional transverse rigidity.

11. A rotor for fans, blowers or the like, comprising a circular 'sup orting plate. a fan plate, peripheral portions of the fan plate comprising blade supports and being held in abutting engagement with the sup-` porting lplate, said b ade supports each having a su stantial area, integral extensions of said peripheral portiqns being bent out to form blades, said fan plate having its central portion dished away from the supporting late and its peripheral portion in close para elism therewith to provide the rotor with additional transverse rigidity.

12. A rotor for: fans, blowers or the like, comprising a circular supporting plate, a sheet metal fan plate, periphera portions of the fan pl'ate comprising blade supports and being held in abutting engagement with the supporting plate, said blade supports having a substantial area, integral extensions of said supports being bent out to form blades, and welds securing theperipheral portions to the supporting plate, said welds f being disposed at a part ofveach blade support, which is spaced from the blade that is inte al therewith.

Si ed by me at Lynn, Massachusetts this 9th ay. of August, 1927..

SINIUS M. HANSEN. 

